Star · K2III
23 Hya
23 Hya is a giant star of spectral type K2III in the constellation Hydra, 347.8 light-years from the Sun.
| Other names | HIP 45527 |
|---|---|
| Constellation | Hydra |
| Distance | 347.8 light-years (106.6 pc) |
| Apparent magnitude | magnitude 5.24 |
| Absolute magnitude | magnitude 0.10 |
| Spectral type | K2III |
| Surface temperature | 4,360 K |
| Luminosity | 158 L☉ |
| Radius | 22 R☉ |
| Mass | 3.86 M☉ (estimated) |
| Right ascension (J2000) | 9h 16m 41.7s |
| Declination (J2000) | −6° 21′ 11″ |
| Space velocity (relative to the Sun) | 20.1 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.24). Visible from the whole Southern Hemisphere and north to latitude 84° N. It stands highest at midnight in February, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1678. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 6.2 million years.
The Sun seen from there
From a planet around 23 Hya, the Sun would look like a star of magnitude 9.97, in the direction where our sky has the constellation Equuleus. It would be invisible to the naked eye.
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.